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          <h1 class="post-title" itemprop="name headline">Spring Boot Logback在/tmp目录下生成spring.log文件问题</h1>
        

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        <p><img src="/upload/homePage/20181110231002.jpg" alt="homePage"><br><a id="more"></a></p>
<h2 id="情景"><a href="#情景" class="headerlink" title="情景"></a>情景</h2><p>在服务器/tmp目录会生成spring.log文件，占用系统磁盘资源，手动删除后因程序仍占用该文件，必须重启服务后这部分空间才会得到释放，spring.log文件中的内容为相应Spring Boot服务的debug日志。</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">[root@iZm5eiwj8z018g7vbitl2sZ tmp]# ls</span><br><span class="line">spring.log</span><br><span class="line">spring.log.1</span><br><span class="line">spring.log.2</span><br><span class="line">spring.log.3</span><br><span class="line">spring.log.4</span><br><span class="line">spring.log.5</span><br><span class="line">spring.log.6</span><br><span class="line">spring.log.7</span><br><span class="line">...</span><br></pre></td></tr></table></figure>
<h2 id="原因"><a href="#原因" class="headerlink" title="原因"></a>原因</h2><p>项目使用的日志框架为logback，并在resource下配置了logback-spring.xml，在logback配置的日志目录是会正常生成日志的，并且每天自动切分，/tmp/spring.log下的日志就纯属是多余的，那为什么会打印这部分多余的日志呢？</p>
<p>首先因为使用的logback是Spring Boot logging包中自带的，所以可以基本排除是jar包版本问题，那么我们对其进行配置的唯一途径只有配置文件：logback-spring.xml，其内容如下：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br></pre></td><td class="code"><pre><span class="line">&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;</span><br><span class="line">&lt;configuration&gt;</span><br><span class="line">    &lt;include resource=&quot;org/springframework/boot/logging/logback/base.xml&quot; /&gt;</span><br><span class="line">    &lt;root level=&quot;INFO&quot;&gt;</span><br><span class="line">    	&lt;appender-ref ref=&quot;CONSOLE&quot; /&gt;</span><br><span class="line">    &lt;/root&gt;</span><br><span class="line">    &lt;!-- INFO级别日志 --&gt;</span><br><span class="line">    &lt;appender name=&quot;infoAppender&quot; class=&quot;ch.qos.logback.core.rolling.RollingFileAppender&quot;&gt;</span><br><span class="line">        &lt;file&gt;/kindle-manager-logs/com/kindle/quartz/info.log&lt;/file&gt;</span><br><span class="line">        &lt;rollingPolicy class=&quot;ch.qos.logback.core.rolling.TimeBasedRollingPolicy&quot;&gt;  </span><br><span class="line">            &lt;fileNamePattern&gt;/kindle-manager-logs/com/kindle/quartz/info-%d&#123;yyyy-MM-dd&#125;.log&lt;/fileNamePattern&gt;</span><br><span class="line">        &lt;/rollingPolicy&gt;  </span><br><span class="line">        &lt;encoder&gt;  </span><br><span class="line">            &lt;pattern&gt;%d&#123;HH:mm:ss.SSS&#125; [%thread] %-5level %logger&#123;40&#125; - %msg%n&lt;/pattern&gt;  </span><br><span class="line">        &lt;/encoder&gt;</span><br><span class="line">        &lt;filter class=&quot;ch.qos.logback.classic.filter.LevelFilter&quot;&gt;&lt;!-- 只打印Info日志 --&gt;  </span><br><span class="line">            &lt;level&gt;INFO&lt;/level&gt;  </span><br><span class="line">            &lt;onMatch&gt;ACCEPT&lt;/onMatch&gt;  </span><br><span class="line">            &lt;onMismatch&gt;DENY&lt;/onMismatch&gt;  </span><br><span class="line">        &lt;/filter&gt;</span><br><span class="line">    &lt;/appender&gt;</span><br><span class="line">    &lt;!-- DEBUG级别日志 --&gt;</span><br><span class="line">    &lt;appender name=&quot;debugAppender&quot; class=&quot;ch.qos.logback.core.rolling.RollingFileAppender&quot;&gt;  </span><br><span class="line">        &lt;file&gt;/kindle-manager-logs/com/kindle/quartz/debug.log&lt;/file&gt;</span><br><span class="line">        &lt;rollingPolicy class=&quot;ch.qos.logback.core.rolling.TimeBasedRollingPolicy&quot;&gt;  </span><br><span class="line">            &lt;fileNamePattern&gt;/kindle-manager-logs/com/kindle/quartz/debug%d&#123;yyyy-MM-dd&#125;.log&lt;/fileNamePattern&gt;</span><br><span class="line">        &lt;/rollingPolicy&gt;  </span><br><span class="line">        &lt;encoder&gt;  </span><br><span class="line">            &lt;pattern&gt;%d&#123;HH:mm:ss.SSS&#125; [%thread] %-5level %logger&#123;40&#125; - %msg%n&lt;/pattern&gt;  </span><br><span class="line">        &lt;/encoder&gt;</span><br><span class="line">        &lt;filter class=&quot;ch.qos.logback.classic.filter.LevelFilter&quot;&gt;&lt;!-- 只打印debug日志 --&gt;  </span><br><span class="line">            &lt;level&gt;DEBUG&lt;/level&gt;  </span><br><span class="line">            &lt;onMatch&gt;ACCEPT&lt;/onMatch&gt;  </span><br><span class="line">            &lt;onMismatch&gt;DENY&lt;/onMismatch&gt;  </span><br><span class="line">        &lt;/filter&gt;</span><br><span class="line">    &lt;/appender&gt;</span><br><span class="line">    &lt;!-- ERROR级别日志 --&gt;</span><br><span class="line">    &lt;appender name=&quot;errorAppender&quot; class=&quot;ch.qos.logback.core.rolling.RollingFileAppender&quot;&gt;  </span><br><span class="line">        &lt;file&gt;/kindle-manager-logs/com/kindle/quartz/error.log&lt;/file&gt;</span><br><span class="line">        &lt;rollingPolicy class=&quot;ch.qos.logback.core.rolling.TimeBasedRollingPolicy&quot;&gt;  </span><br><span class="line">            &lt;fileNamePattern&gt;/kindle-manager-logs/com/kindle/quartz/error-%d&#123;yyyy-MM-dd&#125;.log&lt;/fileNamePattern&gt;</span><br><span class="line">        &lt;/rollingPolicy&gt;  </span><br><span class="line">        &lt;encoder&gt;  </span><br><span class="line">            &lt;pattern&gt;%d&#123;HH:mm:ss.SSS&#125; %thread %X&#123;invokeNo&#125; %logger&#123;40&#125; %msg%n&lt;/pattern&gt;  </span><br><span class="line">        &lt;/encoder&gt;  </span><br><span class="line">        &lt;filter class=&quot;ch.qos.logback.classic.filter.LevelFilter&quot;&gt;&lt;!-- 只打印错误日志 --&gt;  </span><br><span class="line">            &lt;level&gt;ERROR&lt;/level&gt;  </span><br><span class="line">            &lt;onMatch&gt;ACCEPT&lt;/onMatch&gt;  </span><br><span class="line">            &lt;onMismatch&gt;DENY&lt;/onMismatch&gt;  </span><br><span class="line">        &lt;/filter&gt;</span><br><span class="line">    &lt;/appender&gt;</span><br><span class="line">    &lt;!-- JAVA程序日志 --&gt;</span><br><span class="line">    &lt;logger name=&quot;com.kindle&quot; level=&quot;DEBUG&quot; &gt;</span><br><span class="line">    	&lt;appender-ref ref=&quot;infoAppender&quot; /&gt;</span><br><span class="line">    	&lt;appender-ref ref=&quot;debugAppender&quot; /&gt;</span><br><span class="line">    	&lt;appender-ref ref=&quot;errorAppender&quot; /&gt;</span><br><span class="line">    &lt;/logger&gt;</span><br><span class="line">    &lt;!-- dev,test环境下日志 --&gt;</span><br><span class="line">    &lt;springProfile name=&quot;dev,test&quot;&gt;</span><br><span class="line">    	&lt;logger name=&quot;com.kindle&quot; level=&quot;DEBUG&quot; /&gt;</span><br><span class="line">    &lt;/springProfile&gt;</span><br><span class="line">    &lt;!-- prod环境下日志 --&gt;</span><br><span class="line">    &lt;springProfile name=&quot;prod&quot;&gt;</span><br><span class="line">    	&lt;logger name=&quot;com.kindle&quot; level=&quot;INFO&quot; /&gt;</span><br><span class="line">    &lt;/springProfile&gt;</span><br><span class="line">&lt;/configuration&gt;</span><br></pre></td></tr></table></figure>
<p>在网上搜索了一下，发现是很常见的logback配置，在各种博客中都有相似的配置内容。</p>
<p>没办法，单纯从配置上并不能看出问题所在，我们只有查一下源码中打印该日志的位置，在IDE中搜索一下spring.log，结果如下:</p>
<p><img src="/upload/Spring-Boot-Logback/Spring-Boot-Logback_1.png" alt="Spring-Boot-Logback_1.png"></p>
<p>可以看到仅在base.xml和LogFile的toString方法中有spring.log。</p>
<p><img src="/upload/Spring-Boot-Logback/Spring-Boot-Logback_2.png" alt="Spring-Boot-Logback_2.png"></p>
<p>通过base.xml第9行，我们可以看到应该就是这个配置文件导致了spring.log的生成。</p>
<p>再继续搜索一下哪里调用的LogFile，LogFile调用的地方就比较多了，我们每个都点开看一下，最后在下图的类中发现了关键的信息。</p>
<p><img src="/upload/Spring-Boot-Logback/Spring-Boot-Logback_3.png" alt="Spring-Boot-Logback_3.png"></p>
<p>在上图中可以看到有一个类名为DefaultLogbackConfiguration，在该类第85行，有调用LogFile的toString方法。</p>
<p>那么我们怀疑可能就是这个类追加的spring.log文件内容，再看一下该类的注释，在其注释上有一行信息，内容如下：</p>
<p><img src="/upload/Spring-Boot-Logback/Spring-Boot-Logback_4.png" alt="Spring-Boot-Logback_4.png"></p>
<p>查看一下注释上的这个配置文件file-appender.xml的内容。</p>
<p><img src="/upload/Spring-Boot-Logback/Spring-Boot-Logback_5.png" alt="Spring-Boot-Logback_5.png"></p>
<p>调查到这里我们能够确定就是这个file-appender.xml，追加的spring.log文件内容。</p>
<h2 id="解决方案"><a href="#解决方案" class="headerlink" title="解决方案"></a>解决方案</h2><p>我们分析之后，确定了spring.log的生成和内容追加的代码位置，那么我们只要相应屏蔽这两部分的代码，那么就可以解决日志重复生成的问题了。</p>
<p>base.xml是在logback-spring.xml第一行引用的，我们将其内容拷出，注释其引用，并将原配置中的File相关标签移除，最终修改后配置如下：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">&lt;configuration&gt;</span><br><span class="line">    &lt;!--&lt;include resource=&quot;org/springframework/boot/logging/logback/base.xml&quot; /&gt;--&gt;</span><br><span class="line">    &lt;include resource=&quot;org/springframework/boot/logging/logback/defaults.xml&quot; /&gt;</span><br><span class="line">    &lt;include resource=&quot;org/springframework/boot/logging/logback/console-appender.xml&quot; /&gt;</span><br><span class="line">    &lt;root level=&quot;INFO&quot;&gt;</span><br><span class="line">    	&lt;appender-ref ref=&quot;CONSOLE&quot; /&gt;</span><br><span class="line">    &lt;/root&gt;</span><br><span class="line">    ...</span><br><span class="line">&lt;/configuration&gt;</span><br></pre></td></tr></table></figure>
<h2 id="结论"><a href="#结论" class="headerlink" title="结论"></a>结论</h2><p>修改后，替换测试环境logback日志配置文件，重启服务后，spring.log没有重新生成，确认问题解决。</p>

      
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